The ICM7216 is a little newer, although both are classed as obsolete, they are still available from eBay for under $10 each.

I will look into using a Teensy 3.x as a frequency counter/period timer. An issue is the ability to calibrate, as the clock on the Teensy is not adjustable.

Looks like the FreqCount and FreqMeasure libraries are good from 0.1Hz to 65MHz. Shouldn't use any code that uses interrupts while doing this, though.FreqCount: best for 1 kHz to 8 MHz (up to 65 MHz with Teensy 3.0 & 3.1)FreqMeasure: best for 0.1 Hz to 1 kHzhttps://www.pjrc.com/teensy/td_libs_FreqCount.html

To measure period on a Teensy should just need the use of micros() and an interrupt.

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